RR Slider Style issue

I've found a little issue with sliders style in RR. In Skin Commands.txt is indicated an images range from 0 to 20 (21 images), but i've noticed that in some sliders (main volume, balance, and all the mixer levels) the real range is from 0 to 19 (20 images).
I think that the problem is caused by some rounded values inside the code.

Also, the above could easily happen for instance if RR could not load image 20 for instance. I have seen compressed GIF files that don't work in RR for instance, so in doubt, swap the number of two files and see if both files do work in different positions.

I hate to wake up a dead topic but this fits my problem to a T. I can't seem to find an answer to this problem. All the sliders seem to repeating postion 0 twice or something and position 20 is isn't being read. It also does this for the clicking position...for example if I click on a region in a song the bar moves to the region previous to the one I click on. Anyone else having this problem?

Seriously....how do I get to that code to fix it? I assume it's in the RoadRunner exe but I did some searching and from what I can tell it's rather difficult to change a compiled exe. I know nothing about coding.